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When using a tape, hardly could us find the beginning of it.
We print a “wave” on the tape that you can decide from where to rive the tape by finding whether the wave is continuous or not.
The integrated wave means the tape is continuous. You can't rive the tape from here.
You can rive the tape from where the wave is discontinuous.
This way, you can easily rive the tape.
Zhao Xue，Wen Zhonghe,Wang Chao